Detect which version of yarn is being used

[eerhardt]

Description

Change the install args based on yarn 1.x or 2+

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
• Did you add public API?
  • No
• Does the change make any security assumptions or guarantees?
  • No
• Does the change require an update in our Aspire docs?
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 12633

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12633"

[Copilot]

Pull Request Overview

This PR improves the default Yarn install arguments in publish mode by adding version detection logic. The code now differentiates between Yarn 1.x (Classic) and Yarn 2+ (Berry) and uses the appropriate flag for each version.

Key changes:

• Modified GetDefaultYarnInstallArgs to detect Yarn version based on presence of .yarnrc.yml or .yarn/releases directory
• Changed default behavior to use --frozen-lockfile for Yarn 1.x and --immutable for Yarn 2+
• Added test coverage for the new Yarn version detection logic

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Aspire.Hosting.NodeJs/NodeExtensions.cs	Implemented Yarn version detection logic in GetDefaultYarnInstallArgs to return appropriate install flags based on detected version
tests/Aspire.Hosting.NodeJs.Tests/PackageInstallationTests.cs	Updated existing test to expect --frozen-lockfile for Yarn 1.x and added two new tests verifying --immutable flag when Yarn 2+ indicators are present

[adamint]

lgtm, other than adding a comment for additional context

[eerhardt]

/backport to release/13

[github-actions]

Started backporting to release/13: https://github.com/dotnet/aspire/actions/runs/19048867211

[github-actions]

@eerhardt an error occurred while backporting to "release/13", please check the run log for details!

Error: The specified backport target branch "release/13" wasn't found in the repo.

[eerhardt]

/backport to release/13.0

[github-actions]

Started backporting to release/13.0: https://github.com/dotnet/aspire/actions/runs/19048879965